The Preloading Effects on Fatigue Strength and Fatigue Life

Jinescu, Valeriu V.; Sima, Teodor; Chelu, Angela; Jinescu, Cosmin

doi:10.2507/22nd.daaam.proceedings.559

Cited by 1 publication

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“…For strain exceeded yield strain, like in the case of LCF, the total participation is the sum of the individual participations of strain amplitude and mean strain, namely Generally, the participation of specific energy is defined as the ratio between effective specific energy, E j , and its critical value, E j,cr (Jinescu 2011) where δj=1; 0 or-1 if the energy E j is in the same sense with the process, has no effect upon or opposes the process or phenomenon. The specific energy is For material behavior given by equation (3) The critical values (σcr;ɛcr) refer to failure, buckling, resonance, etc.…”

Section: A New Strength Criterion For Cracked Sample Lcf Fcf and Hcf ...mentioning

confidence: 99%

“…It needs to use another method of superposition which is appropriate to effects superposition in the case of nonlinear behavior. Such a method is based on the principle of critical energy, which has been used for effects superposition when the structure material behaves nonlinear (Jinescu, 1989, 2011, Jinescu, 2012, 2013b, 2013c; Jinescu et al., 2013a,).…”

Section: Introductionmentioning

confidence: 99%

“…Numerous results were obtained for the total cumulation effect of successive loadings, such as fatigue life under blocks of different normal stress amplitudes (Jinescu, 2013b), fatigue under creep conditions (Jinescu, 2011), etc. Separately, high cycle fatigue (HCF) under complex loading (Vu et al, 2014), continuum damage mechanics application in low cycle thermal fatigue (Mashayeki et al, 2013), high cycle fatigue in notched plates (Yanase et al, 2013a(Yanase et al, , 2013b were analyzed.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the participation of specific energy is defined as the ratio between effective specific energy, E j , and its critical value, E j,cr (Jinescu 2011)…”

Section: Introductionmentioning

confidence: 99%

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Effects superposition under imposed deterioration and simultaneous fatigue in different regimes

Jinescu

Nicolof

Terodorescu

2015

International Journal of Damage Mechanics

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The problems of loading superposition of low cycle fatigue, finite cycle fatigue and high cycle fatigue on cracked structure are analyzed. The nonlinear power law behavior of the structure material has been considered. A strength criterion was established for a cracked structure under low cycle fatigue, finite cycle fatigue, and high cycle fatigue loading taking into account the deterioration. On the basis of concept of the specific energy participation and using Basquin's law and Coffin-Manson's law, a general relationship of fatigue life was established in the case of superposition of low cycle fatigue, finite cycle fatigue, and high cycle fatigue loadings on a mechanical structure deteriorated due to cracks. The derived relationships depend on the high cycle fatigue and finite cycle fatigue mean stress and on the low cycle fatigue mean strain, as well as on deterioration. Relationships for the deterioration calculation were established. Experimental work was performed for specimens with cracks, made of steel, statically and cyclically loaded. A numerical example shows how the established relationships may be used.

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Section: A New Strength Criterion For Cracked Sample Lcf Fcf and Hcf ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Generally, the participation of specific energy is defined as the ratio between effective specific energy, E j , and its critical value, E j,cr (Jinescu 2011)…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations